Samarium Cobalt Magnets were developed for US Air Force by University of Dayton Research Institute (UDRI) in 1970s. They are also called Samarium or SMCO Magnets. They are composed of Sm, Co, balance Cu, Zi and Fe. The powders are pressed, sintered, machined and magnetized. They can be only made in simple shapes. To prevent chipping, customers are advised to tumble them which rounds their edges to 0.005-inch radius. Untumbled magnets can chip and create “dirty” magnets. They are expensive, so mainly used in applications that demand exemplary performance at high temperatures. Their energy product ranges 15 to 32 MGOe. Their residual flux density ranges 0.9 to 1.2 T. It is the preferred choice for operation above 150oC, up to 550 oC.
PMAG Database Folder BM lists 694 B(H) Demagnetization Curves of their 159 grades, produced by 23 manufacturers worldwide. For names of all these grades, please click on PMAG, Materials.